Volvo AWD S70 Forum

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MAF / O2 Sensor Problems S70 1999

posted by  RL55 on  Tue Aug 19 13:49 CST 2008
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last visit: Fri Oct 31 08:21 CST 2008
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99 S70GLT with 161,000 miles:
MAF replaced at 124,000. Front O2 sensor replaced at 147,600. Rear O2 sensor replaced at 159,800 and less than a month later needed to be replaced again at 161,000 due to excessive carbon build up. Car still won't pass NJ inspection, now showing P0134 code (front sensor again?). Strong smell of unburned fuel, with excessive black exhaust. Trying to avoid the local dealers as previous experiences have not been great. Any thoughts on what might be going on?








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MAF / O2 Sensor Problems S70 1999

posted by  someone claiming to be ksg on  Fri Aug 22 03:43 CST 2008 [RELATED]

Check or have checked your fuel pressure.








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MAF / O2 Sensor Problems S70 1999

posted by  KlausC on  Tue Aug 19 14:32 CST 2008
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last visit: Fri Oct 24 10:15 CST 2014
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I always ask this question, what do your vacuum lines look like? Original elbows? Those who want to bring their cars to Stage 0 replace their leaky vacuum lines, because a small leak will cause the engine to run rich. Especially that pesky elbow behind the PS pump, coming off the intake manifold.

Klaus
--
I still miss my 164 and my 854T. Just driving a V70R :)







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